46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
// this spawns a child process that listens for SIGHUP when the
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// parent process exits, and after 200ms, sends a SIGKILL to the
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// child, in case it did not terminate.
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import { spawn } from 'child_process';
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const watchdogCode = String.raw `
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const pid = parseInt(process.argv[1], 10)
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process.title = 'node (foreground-child watchdog pid=' + pid + ')'
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if (!isNaN(pid)) {
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let barked = false
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// keepalive
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const interval = setInterval(() => {}, 60000)
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const bark = () => {
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clearInterval(interval)
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if (barked) return
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barked = true
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process.removeListener('SIGHUP', bark)
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setTimeout(() => {
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try {
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process.kill(pid, 'SIGKILL')
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setTimeout(() => process.exit(), 200)
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} catch (_) {}
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}, 500)
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})
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process.on('SIGHUP', bark)
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}
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`;
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/**
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* Pass in a ChildProcess, and this will spawn a watchdog process that
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* will make sure it exits if the parent does, thus preventing any
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* dangling detached zombie processes.
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*
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* If the child ends before the parent, then the watchdog will terminate.
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*/
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export const watchdog = (child) => {
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let dogExited = false;
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const dog = spawn(process.execPath, ['-e', watchdogCode, String(child.pid)], {
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stdio: 'ignore',
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});
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dog.on('exit', () => (dogExited = true));
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child.on('exit', () => {
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if (!dogExited)
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dog.kill('SIGKILL');
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});
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return dog;
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};
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//# sourceMappingURL=watchdog.js.map
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